How is this new topic button achieved?

[merefield (Robert)]

This has been asked before. I provided a detailed answer here:

Floating "New topic" button

I can do better than that … I believe this is the CSS (UPDATED): @mixin buttonShadow { box-shadow: 0 0 4px rgba(0, 0, 0, 0.14), 0 4px 8px rgba(0, 0, 0, 0.28); } @mixin buttonTransition { transition: right 0.5s, bottom 0.5s, border-radius 0.5s, text-indent 0.2s, visibility 1s, width 0.2s ease, height 0.5s ease 0.4s, color 0.5s, background-color 2s, transform 0.5s; } //New Topic Fab #create-topic.btn-default { display: flex; align-items: center; justify-content: center; @inc…

The code might have been tweaked since …